Either there is no Voltage or Vacume going 2 the Valve OR the Passagway under the Valve is Blocked.
Clean the EGR Line with carb cleaner to ensure not any blockage.
If you are referring to the check engine light and are still receiving a code indicating EGR valve, then the problem is that the EGR valve is being effected by the problem. The EGR valve is not the problem, it is just the component that is being effected. Code readers only tell you the effected part, not necessarily the bad part. This is one of the big problems with autozone's free diagnostics, you get what you pay for.
The answer posted previously seems to be taken verbatim from this site, and probably copyrighted there: Mazda EGR Flow: Low or Excessive? http://www.asashop.org/autoinc/sept2002/techtips.cfm and if that doesn't work, there are additional tips here: P0402 EGR code Help - Automotive Message Forums http://www.automotivehelper.com/topic478910.htm
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